/*
 * Copyright (C) 2009 Las Cumbres Observatory (lcogt.net)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.lcogt.tools.fitsviewer.server;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import javax.servlet.ServletContext;

import nom.tam.fits.Fits;
import nom.tam.fits.FitsException;
import nom.tam.fits.Header;
import nom.tam.fits.ImageHDU;
import nom.tam.util.Cursor;

import org.lcogt.tools.fitsviewer.client.FitsHeaderService;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;

public class FitsHeaderServiceImpl extends RemoteServiceServlet implements FitsHeaderService {
	Fits fits;
	ImageHDU imageHDU;
	String basePath;
	String currentPath;
	Properties prop;
	public String[] getFitsHeader(String fileName) {
		//Finds Path on server
		if(prop == null)
		{
			prop = new Properties();
			ServletContext context = getServletContext();
			InputStream is = context.getResourceAsStream("FitsViewer.properties");
			try {
				prop.load(is);
				basePath = prop.getProperty("serverPathOfFitsFiles");
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		
		String[] results= null;
			try {
				//trys to load the fits file
				fits = new Fits(new File(basePath+fileName));
			} catch (FitsException e) {
				e.printStackTrace();
			}
		try{
			//Trys to read the fitsHDU 
			//Then loops through each card in the header and returns the header as a whole
			imageHDU = (ImageHDU) fits.readHDU();
			Header header = imageHDU.getHeader();
			Cursor cursor = header.iterator();
			results = new String[header.getNumberOfCards()];
			for(int i = 0; i < results.length;i++)
			{
				results[i]=cursor.next().toString();
			}
		} catch (Exception e){
			e.printStackTrace();
		}
		return results;
	}

}
